and his 19-year-old brother dzhokhar tsarnaev. the two encountered a police officer on the m.i.t. campus and they're residents of cambridge. the m.i.t. campus is several blocks away from where they live in cambridge. about 10:20, shots were heard fired and around 10:30 a 26-year-old m.i.t. police officer who had just joined the force last year was found dead, shot several times in his car. police say the two suspects then went east from there, several blocks and they carjacked a car at gunpoint. the man says that they stole his debit card, our pete williams reporting that they were then racing to watertown, but they stopped several times at three atms in order to get money. the first was rejected for a bad pin number and at the second stop they withdrew $800 and at the third it's about 11:20 or so they were unsuccessful. so then they went on to memorial drive which is a major drive in cambridge and they released the person who they had carjacked unharmed. the person said that he said -- the two of them said to him that they had ki